If you're searching for free one-time converter tools then, I recommend the ToolsBaer OST to PST converter tool. This tool, with just one click, efficiently converts your entire Offline OST data into PST format. This tool won't cause you any issues during the conversion process. You don’t need to be worried about data loss. This utility ensures that your data remains safe and secure, free from any errors. Users can get a preview of selected OST files before the process of conversion. It also offers a free demo pack to all users to convert a few OST files to PST file format free. This application is compatible with both Windows and Mac operating systems.

Read More - https://www.toolsbaer.com/ost-to-pst-conversion/